99618949 has 2 divisors, whose sum is σ = 99618950. Its totient is φ = 99618948.

The previous prime is 99618947. The next prime is 99618979. The reversal of 99618949 is 94981699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98604900 + 1014049 = 9930^2 + 1007^2 .

It is a cyclic number.

It is not a de Polignac number, because 99618949 - 2¹ = 99618947 is a prime.

Together with 99618947, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99618949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99618941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49809474 + 49809475.

It is an arithmetic number, because the mean of its divisors is an integer number (49809475).

Almost surely, 2^99618949 is an apocalyptic number.

It is an amenable number.

99618949 is a deficient number, since it is larger than the sum of its proper divisors (1).

99618949 is an equidigital number, since it uses as much as digits as its factorization.

99618949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 55.

The square root of 99618949 is about 9980.9292653540. The cubic root of 99618949 is about 463.5685722408.

The spelling of 99618949 in words is "ninety-nine million, six hundred eighteen thousand, nine hundred forty-nine".